Curious, how do YOU check valve guides with the "wiggle" test?

Small Block Mopar Engine

Which way for you?

  1. #1 - wiggle the stem valve shut

    6.3%
  2. #2 - wiggle the head valve open

    93.8%
  3. I'm afraid to attempt it myself :(

    0 vote(s)
    0.0%
  1. Tims 66 Cuda

    Tims 66 Cuda Mopar mid life crisis

    Messages:
    296
    Likes Received:
    156
    Joined:
    May 28, 2018
    Location:
    Poquoson, Va
    Local Time:
    7:19 AM
    I always told wiggle the valve off the seat. Should be .002 to .005 clearance. Dip stem in motor oil, if play goes away your good.

    Tim
     
    • Thanks! Thanks! x 1
    • volaredon

      volaredon Well-Known Member

      Messages:
      472
      Likes Received:
      115
      Joined:
      Feb 28, 2010
      Location:
      IL
      Local Time:
      6:19 AM
      On my last set of EQ heads I bought ("out of the box/ ready to install" Bull$#!t!!!) they did the guides too tight, had #4 exhaust valve hang open and kiss the piston, bend valve. less than 3 hours run time and 6 miles after install. Id save the "wiggle test" for the old school machinist that has been doing headwork for a few years or more.
       
      • Thanks! Thanks! x 1
      • JoePole1

        JoePole1 A dude in a B body FABO Gold Member

        Messages:
        564
        Likes Received:
        483
        Joined:
        Mar 3, 2018
        Location:
        Hudson Valley, NY. NOT NYC!!
        Local Time:
        7:19 AM
        I understand and appreciate years of experience but I did use a dial indicator set up perpendicular to the valve. The heads are new so I doubt there is any taper to the guide. I'll try tomorrow with oil as suggested.
         
      • gregcon

        gregcon Well-Known Member

        Messages:
        633
        Likes Received:
        597
        Joined:
        Dec 20, 2009
        Local Time:
        6:19 AM
        One of the miracles of the internal combustion engine is the valve guide, and the fact that it works at all. We don't supply it with direct oil pressure, and we also put a dedicated seal on it to keep even more oil out. Then, we slide it 2 or 3,000 times per minute and at very cold and very hot temperatures and....it lasts many decades and thousands of miles.
         
        • Agree Agree x 4
        • moper

          moper FABO Gold Member FABO Gold Member

          Messages:
          15,872
          Likes Received:
          1994
          Joined:
          Dec 27, 2004
          Location:
          eastern CT
          Local Time:
          12:19 PM
          The 340 I have for sale is using heads from another engine because the heads on them t were so bad. Like visibly ovalled. No wiggling required... lol
          Worst I’ve ever seen, and they got tossed in the scrap pile.
           
        • RustyRatRod

          RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

          Messages:
          69,420
          Likes Received:
          43957
          Joined:
          Jun 7, 2010
          Location:
          Georgia
          Local Time:
          7:19 AM
          I do the wiggle test but not on valve guides. It keeps Kitty happy.
           
        • oldkimmer

          oldkimmer FABO Gold Member FABO Gold Member

          Messages:
          18,334
          Likes Received:
          5891
          Joined:
          Nov 11, 2006
          Location:
          Kindersley, Saskatchewan,
          Local Time:
          6:19 AM
          I bet she is just a purring. Kim
           
          • Like Like x 1
          • IQ52

            IQ52 Well-Known Member

            Messages:
            2,536
            Likes Received:
            2010
            Joined:
            Jul 30, 2011
            Location:
            Idaho
            Local Time:
            5:19 AM
            I've honed out 1,000 or so guides and measured them with a dial bore gauge. Then installed the valve and wiggled it. Got a pretty good feel for them now.

            But I still need to check w/ the dial bore gauge and make sure I'm not getting them tapered.
             
            • Thanks! Thanks! x 1
            • famous bob

              famous bob mopar misfit

              Messages:
              18,949
              Likes Received:
              8179
              Joined:
              Aug 14, 2011
              Location:
              okla
              Local Time:
              6:19 AM
              not to me . We used to run .0005 clearance w/o a seal on the hemi , never had a problem w/it !~
              My victor type heads had about .001 - .0015 when new, no problems -
               
            • rustycowll69

              rustycowll69 Well-Known Member

              Messages:
              2,372
              Likes Received:
              1115
              Joined:
              Feb 19, 2016
              Location:
              Pacific northwest
              Local Time:
              4:19 AM
              guides are only 1/2 the equation. Sure the guides need to be straight, & round w/no taper, but the valve stems need to be straight, round w/no taper, too.
              I use my valve grinding pilots to check guide size. I actually have a Chrysler tool, which is kind of a short sleeve to slip over the valve stem before you slide the valve into the guide to hold the valve head off of the seat a set amount to check for wobble like they show in the FSM. I rarely use it, though, because it's only made for stock valves and stock heads, and I feel I have acquired a better feel for what kind of clearance I'm looking for anyway.
               
              • Like Like x 1
              1. This site uses cookies to help personalize content, tailor your experience and to keep you logged in if you register.
                By continuing to use this site, you are consenting to our use of cookies.